Bigloo XML Application Server
This project is dedicated to research and development of an XML application server based on Bigloo and SXML

Spiffy
SXML-enabled Web server in Chicken Scheme.

mod_pipe
Apache module which provides a mean for communication between Apache server and an external process using Unix pipes

cURL bindings
Bigloo bindings for libcurl library

The influence of browsers on evaluators or, continuations to program web servers.
ICFP'2000 paper by Christian Queinnec on computation-centric continuations-based application servers.

PLT Web server
is a practical implementation of this approach.
It's included in DrScheme and MzScheme distributions available from http://www.plt-scheme.org.